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The default plastic type is
The default plastic type is integer. In Java, integer is one of the types. By default, integer is followed by a letter L or L to represent a long value, that is, an int type. Java is completely object-oriented, but simple data types are not, similar to simple data types in most other non-object-oriented languages. The reason for this is efficiency. Introducing simple data types into object-oriented will not have much impact on execution efficiency.